Planning a new system

[David E]

Some advice please.

What I am doing is converting a barn to include a kitchen, 2 downstairs bathrooms (bath/basin/toilet) and an upstairs shower room (shower/basin/toilet). We are on our own water supply so mains pressure and flow is fine.

My plan is:
Mains in and to the kitchen then to a 50 gal tank in the roof. On it’s way to the roof taking a T to one bathroom for it’s cold water to save on pipe work. From the tank I am feeding 2 of 36”*18” direct hot water cylinders each of which will be output separately to Kitchen/Bathroom 1 and Shower room/Bathroom 2.

Is one 22mm outlet from the tank sufficient for two cylinders and two toilets/two baths and two sinks (the likelihood of them all being used at once is small but I suppose possible) or should I take one for each cylinder and share out the cold as well?

Also from the tank I am going to take a 22mm outlet to the cold side of the shower (Mira Excel) so as to have a balanced pressure (ie not gravity hot and mains cold) that won’t be interrupted by toilets flushing etc. I will use 22mm throughout for all gravity fed hot & cold.

Dose this make sense or are there flaws in my plan.

 

[htgeng]

Some advice please.

yep, well how much do you pay for the architect to draw up plans for the barn? I recommend you pay a heating engineer at hourly rate to design the system.

We can all give you well meaning snippets of info here, but we can't design the whole system without seeing the job. Would an architect come up with the design of a house over an internet forum?

 

[doitall]

em

you need 28mm to feed the 2 cylinders if the're connected together, or 22mm to each if seperate to each bathroom.

You also need 22mm cold feed to each bathroom.

I also doubt 50 gallon tank is large enough.

 

[ChrisR]

Do you want to clean your teeth in tank water or mains - think about it.
What about noise from refilling WC suppllies in the night.. etc etc..
Pay a plumber.